Operating System Cannot acess Navision

While trying to access Navision, the following error message occurs

The operating system cant access the file C:\Programs\MicrosoftBusinessSolutions-Navision\Client\PGT\fin.smt


Can anybody shed some light on this, i thougt the user might of have erased the fin file, but it still exists.The computer is the same, and it hasn´t been formatted...